Didn't you ask this exact same question in October?
http://www.bladeforums.com/forums/showthread.php/1337811-Spyderco-Delica-4-for-Duty-Use
Also, in your very first post ever, you mentioned that you had owned a Delica and an Endura and didn't like them. Have you reconsidered?
If you would explain what you actually need to use the knife for in your duties, that might help people answer. "Tactical" has become almost a meaningless marketing term, but originally it implied that the knife might need to be used as a weapon. Is that what you are looking for?
Without further information to go on, I would say that a Delica 4 would be fine as a general purpose cutting tool. I have one and it is a nice, lightweight ergonomic knife with a good blade profile.